PhilF51 wrote: Colin, how far back from front of wing did you put the hook for bungy launch? I would assume it should be just forward of the CG?
Phil - Hook is 142mm back from the leading edge, C of G is 200mm so 58 mm in front of c of G.
In that position it is very stable off the bungee / ramp..
I glued a piece of 1/8 the ply 1 in Square into the foam using p.v.a glue & screwed the hook into it.
Best of luck with the maiden flight.
Colin.
